amfs_union.c revision 42629
1/* 2 * Copyright (c) 1997-1998 Erez Zadok 3 * Copyright (c) 1990 Jan-Simon Pendry 4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Jan-Simon Pendry at Imperial College, London. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgment: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * %W% (Berkeley) %G% 40 * 41 * $Id: amfs_union.c,v 1.1.1.1 1998/11/05 02:04:47 ezk Exp $ 42 * 43 */ 44 45/* 46 * Union automounter file system 47 */ 48 49#ifdef HAVE_CONFIG_H 50# include <config.h> 51#endif /* HAVE_CONFIG_H */ 52#include <am_defs.h> 53#include <amd.h> 54 55/**************************************************************************** 56 *** FORWARD DEFINITIONS *** 57 ****************************************************************************/ 58static void amfs_union_mounted(mntfs *mf); 59 60 61/**************************************************************************** 62 *** OPS STRUCTURES *** 63 ****************************************************************************/ 64am_ops amfs_union_ops = 65{ 66 "union", 67 amfs_auto_match, 68 0, /* amfs_auto_init */ 69 amfs_toplvl_mount, 70 0, 71 amfs_toplvl_umount, 72 0, 73 amfs_auto_lookuppn, 74 amfs_auto_readdir, 75 0, /* amfs_toplvl_readlink */ 76 amfs_union_mounted, 77 0, /* amfs_toplvl_umounted */ 78 find_amfs_auto_srvr, 79 FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY 80}; 81 82 83/* 84 * Create a reference to a union'ed entry 85 * XXX: this function may not be used anywhere... 86 */ 87static int 88create_amfs_union_node(char *dir, voidp arg) 89{ 90 if (!STREQ(dir, "/defaults")) { 91 int error = 0; 92 (void) amfs_toplvl_ops.lookuppn(arg, dir, &error, VLOOK_CREATE); 93 if (error > 0) { 94 errno = error; /* XXX */ 95 plog(XLOG_ERROR, "Could not mount %s: %m", dir); 96 } 97 return error; 98 } 99 return 0; 100} 101 102 103static void 104amfs_union_mounted(mntfs *mf) 105{ 106 int i; 107 108 amfs_auto_mkcacheref(mf); 109 110 /* 111 * Having made the union mount point, 112 * populate all the entries... 113 */ 114 for (i = 0; i <= last_used_map; i++) { 115 am_node *mp = exported_ap[i]; 116 if (mp && mp->am_mnt == mf) { 117 /* return value from create_amfs_union_node is ignored by mapc_keyiter */ 118 (void) mapc_keyiter((mnt_map *) mp->am_mnt->mf_private, 119 (void (*)(char *, voidp)) create_amfs_union_node, 120 mp); 121 break; 122 } 123 } 124} 125